AD7863ARSZ-10

Overview

The AD7863ARSZ-10 is a dual-channel, 14-bit successive approximation analog-to-digital converter (ADC) manufactured by Analog Devices. It operates from a single 5 V supply and supports a sampling rate of 175 kSPS with a conversion time of 5.2 μs. The device features four single-ended analog inputs grouped into two channels (A and B), selectable via the A0 pin. It provides an input voltage range of ±10 V and includes overvoltage protection up to ±17 V. Key electrical parameters include a typical power dissipation of 70 mW in normal mode, a signal-to-noise ratio of 78 dB minimum, and a differential nonlinearity of +2/-1 LSB.

Feature Summary

• Simultaneous sampling and conversion on two independent channels to preserve relative phase information.
• Integrated internal 2.5 V reference with provision for external reference connection.
• High-speed parallel interface compatible with standard microprocessor control signals.
• Automatic power-down mode that minimizes energy consumption between conversion cycles.

Applications

• Vector motor control systems requiring precise phase data.
• Industrial process control applications utilizing standard ±10 V sensor signals.
• Portable instrumentation powered by battery supplies due to low-power operation.

Procurement Notes

Verify the specific suffix 'ARSZ-10' against the manufacturer's current ordering guide to confirm package type and temperature grade. Ensure the selected variant matches the required ±10 V input range specification. Cross-reference the component marking with official datasheet documentation to validate authenticity before integration.

Selection Notes

Select this component when simultaneous sampling of two channels is critical for maintaining signal phase relationships. The ±10 V input range makes it suitable for direct interfacing with industrial sensors without additional attenuation circuitry. Consider the 14-bit resolution and 175 kSPS throughput for high-speed data acquisition requirements.

Part Context

The AD7863 serves as a 14-bit lead-compatible upgrade to the AD7862. It utilizes Linear Compatible CMOS (LC2MOS) technology to combine precision bipolar circuits with low-power CMOS logic. The device is available in 28-lead SOIC_W and SSOP packages, designed for robust performance in mixed-signal environments.

Replacement Considerations

The AD7862 is a 12-bit predecessor with similar functionality but lower resolution. Verify if the increased bit depth and updated input ranges of the AD7863 are necessary for the application design.

FAQ

How does the AD7863 handle channel selection?

Channel selection is determined by the A0 input pin. If A0 is low during the CONVST pulse, Channel A (VA1/VA2) is selected; if A0 is high, Channel B (VB1/VB2) is selected.

What is the maximum overvoltage protection rating?

For the AD7863-10 variant, the analog inputs can withstand voltages up to ±17 V without damage, exceeding the nominal ±10 V operating range.

Can the internal reference be bypassed?

Yes, an external 2.5 V reference can be connected to the VREF pin to override the internal reference source, allowing for system-wide reference synchronization.